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2 Node Cluster 1 node is dominant & 1 node is dormant to tcpip activities

 
Larry Hotard
Occasional Contributor

2 Node Cluster 1 node is dominant & 1 node is dormant to tcpip activities

The last node booted becomes the dominant node
for all TCPIP activities to where you can ping
out and other outside cluster nodes can ping
it while the other node in the same cluster
becomes dormant to TCPIP activities to where you cannot ping out nor any node can ping to
it. If you boot the dormant node, then the
dormant node becomes dominant while dominant
node becomes dormant. I did notice that the change occurs during the boot.

Any ideas on why this is occurring?

Hardware is ES40 system.
Software is OpenVMS 7.3-2
TCPIP Version is TCPIP_ECO V5.4-156

Both nodes do show up on show cluster command
and are booting from correct boot disk.




5 REPLIES 5
Karl Rohwedder
Honored Contributor

Re: 2 Node Cluster 1 node is dominant & 1 node is dormant to tcpip activities

Perhaps you can show us the output from some TCPIP commands, e.g. SHOW INTERFACE, SHOW ROUTE?

regards Kalle
Hoff
Honored Contributor

Re: 2 Node Cluster 1 node is dominant & 1 node is dormant to tcpip activities

"ping out" meaning what? I'm guessing there's a cluster alias here.

DNS Clustering via Load Broker or Metric Server?

Is FailSAFE or LAN Failover in use?

IP clustering and IP itself doesn't necessarily do what you might expect from experience with DECnet and the DECnet cluster alias, because (in simplest terms) IP isn't DECnet.

IP can easily be configured with wonky routing or wonky DNS. And sometimes simply getting IP configured can be interesting, too.
Larry Hotard
Occasional Contributor

Re: 2 Node Cluster 1 node is dominant & 1 node is dormant to tcpip activities

The show interface and route does not show
anything unusual in comparison to other clusters. Sorry I'm not able show the
display results for security reasons.

By saying ping out is to ping other IP
addresses outside the node via TCPIP> PING
command. No failover or failsafe is in use.

Decnet is setup on it's own nic card and
is functioning.

No to DNS and Alias cluster questions.
Hoff
Honored Contributor

Re: 2 Node Cluster 1 node is dominant & 1 node is dormant to tcpip activities

Having several hosts and each with unique IP addresses operating within a cluster should not and does not have a "primary" host. Not unless you're working with FailSAFE or cluster aliases or other such mechanisms, mechanisms which are intended to "spoof" the return address, that is.

The local IP network configuration is almost certainly incorrect.

Somewhere.

Either with TCP/IP Services, within a firewall that might be lurking, or with a router or subnet or VLAN configuration setting. The cabling and the NICs are probably OK, given you indicate the active host is moving around.

The possibilities for a trigger here are, well, endless. This is IP, after all.

Start by segmenting the networks, and by researching the switches and firewalls that might be (or are) present here. Running both in-bound and out-bound ping tests for each network segment and each host.

Do trust what the local network team tells you, but also remain skeptical and do ensure you specifically verify all of you are told by your networking team.

Do have another set of eyeballs verify the IP network configuration of each of the cluster hosts.

Do verify the TCP/IP database files are in the expected directories.

Make sure that full privileges are enabled when working with ping. (There have been a few weird errors and silent failures here over the years.)

Do check that any managed switch firmware is current too, as down-revision firmware has led to many weird errors over the years.

If local policy precludes showing the details here and only permits descriptions of the configuration in general details, then -- if running the usual debugging by division and if a second review of the configuration fails to isolate a trigger -- you're likely going to have to call in somebody in possession of whatever appropriate security ratings or approvals are needed to take a look at this. We need details beyond what are posted here, and probably beyond what you're permitted to post.
Larry Hotard
Occasional Contributor

Re: 2 Node Cluster 1 node is dominant & 1 node is dormant to tcpip activities

No solutions were found.